 January 2003, Part 1
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21 When a neutral metal sphere is charged by contact with a positively charged glass rod, the sphere

(1) loses electrons
(2) gains electrons
(3) loses protons
(4) gains protons

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22 If 10. coulombs of charge are transferred through an electric circuit in 5.0 seconds, then the current in the circuit is

(1) 0.50 A
(2) 2.0 A
(3) 15 A
(4) 50. A

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23 The diagram below represents a source of potential difference connected to two large, parallel metal plates separated by a distance of 4.0 × 10–3 meter. Which statement best describes the electric field strength between the plates?

(1) It is zero at point B.
(2) It is a maximum at point B.
(3) It is a maximum at point C.
(4) It is the same at points A, B, and C.

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24 A periodic wave transfers

(1) energy, only
(2) mass, only
(3) both energy and mass
(4) neither energy nor mass

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Note that question 25 has only three choices.

25 As the potential difference across a given resistor is increased, the power expended in moving charge through the resistor

(1) decreases
(2) increases
(3) remains the same

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26 An electric iron operating at 120 volts draws 10. amperes of current. How much heat energy is delivered by the iron in 30. seconds?

(1) 3.0 × 102 J
(2) 1.2 × 103 J
(3) 3.6 × 103 J
(4) 3.6 × 104 J

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27 A motor is used to produce 4.0 waves each second in a string. What is the frequency of the waves?

(1) 0.25 Hz
(2) 15 Hz
(3) 25 Hz
(4) 4.0 Hz

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28 The diagram below shows a periodic wave. Which points are in phase with each other?

(1) A and C
(2) A and D
(3) B and C
(4) C and D

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29 A surfacing whale in an aquarium produces water wave crests having an amplitude of 1.2 meters every 0.40 second. If the water wave travels at 4.5 meters per second, the wavelength of the wave is

(1) 1.8 m
(2) 2.4 m
(3) 3.0 m
(4) 11 m

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30 In a certain material, a beam of monochromatic light (f = 5.09 × 1014 hertz) has a speed of 2.25 × 108 meters per second. The material could be

(1) crown glass
(2) flint glass
(3) glycerol
(4) water

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31 Orange light has a frequency of 5.0 × 1014 hertz in a vacuum. What is the wavelength of this light?

(1) 1.5 × 1023 m
(2) 1.7 × 106 m
(3) 6.0 × 10–7 m
(4) 2.0 × 10–15 m

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32 A radar gun can determine the speed of a moving automobile by measuring the difference in frequency between emitted and reflected radar waves. This process illustrates

(1) resonance
(2) the Doppler effect
(3) diffraction
(4) refraction

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33 The diagram below shows a standing wave. Point A on the standing wave is

(1) a node resulting from constructive interference
(2) a node resulting from destructive interference
(3) an antinode resulting from constructive interference
(4) an antinode resulting from destructive interference

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34 An object possessing an excess of 6.0 × 106 electrons has a net charge of

(1) 2.7 × 10–26 C
(2) 5.5 × 10–24 C
(3) 3.8 × 10–13 C
(4) 9.6 × 10–13 C

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35 One watt is equivalent to one

(1) N•m
(2) N/m
(3) J•s
(4) J/s

Directions (36–50): For each statement or question, write on the separate answer sheet, the number of the word or expression that, of those given, best completes the statement or answers the question.
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36 Which pair of forces acting concurrently on an object will produce the resultant of greatest magnitude? 1 2 3
Note that question 37 has only three choices.

37 The diagram below shows a force of magnitude F applied to a mass at angle face="Symbol">q relative to a horizontal frictionless surface. As angle face="Symbol">q is increased, the horizontal acceleration of the mass

(1) decreases
(2) increases
(3) remains the same

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38 The mass of a high school football player is approximately

(1) 100 kg
(2) 101 kg
(3) 102 kg
(4) 103 kg

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39 A constant force is used to keep a block sliding at constant velocity along a rough horizontal track. As the block slides, there could be an increase in its

(1) gravitational potential energy, only
(2) internal energy, only
(3) gravitational potential energy and kinetic energy
(4) internal energy and kinetic energy

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40 A photon of which electromagnetic radiation has the most energy?

(1) ultraviolet
(2) x ray
(3) infrared
(4) microwave Additional Tests
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